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| author | Max Filippov <jcmvbkbc@gmail.com> | 2022-04-15 13:05:31 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-02 05:51:23 +0300 |
| commit | 11e969bc964a0e50ae64cdba092048e3937d2389 (patch) | |
| tree | 99303eb470e622faf5397649005d6f221f46bdb0 /arch/xtensa/kernel/asm-offsets.c | |
| parent | f29cab2906346fa93831376256e01f5a6629f979 (diff) | |
| download | linux-11e969bc964a0e50ae64cdba092048e3937d2389.tar.xz | |
xtensa: support coprocessors on SMP
Current coprocessor support on xtensa only works correctly on
uniprocessor configurations. Make it work on SMP too and keep it lazy.
Make coprocessor_owner array per-CPU and move it to struct exc_table for
easy access from the fast_coprocessor exception handler. Allow task to
have live coprocessors only on single CPU, record this CPU number in the
struct thread_info::cp_owner_cpu. Change struct thread_info::cpenable
meaning to be 'coprocessors live on cp_owner_cpu'.
Introduce C-level coprocessor exception handler that flushes and
releases live coprocessors of the task taking 'coprocessor disabled'
exception and call it from the fast_coprocessor handler when the task
has live coprocessors on other CPU.
Make coprocessor_flush_all and coprocessor_release_all work correctly
when called from any CPU by sending IPI to the cp_owner_cpu. Add
function coprocessor_flush_release_all to do flush followed by release
atomically. Add function local_coprocessors_flush_release_all to flush
and release all coprocessors on the local CPU and use it to flush
coprocessor contexts from the CPU that goes offline.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/asm-offsets.c')
| -rw-r--r-- | arch/xtensa/kernel/asm-offsets.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/asm-offsets.c b/arch/xtensa/kernel/asm-offsets.c index 37278e2785fb..e3b9cf4c2289 100644 --- a/arch/xtensa/kernel/asm-offsets.c +++ b/arch/xtensa/kernel/asm-offsets.c @@ -91,10 +91,12 @@ int main(void) /* struct thread_info (offset from start_struct) */ DEFINE(THREAD_RA, offsetof (struct task_struct, thread.ra)); DEFINE(THREAD_SP, offsetof (struct task_struct, thread.sp)); - DEFINE(THREAD_CPENABLE, offsetof (struct thread_info, cpenable)); #if XCHAL_HAVE_EXCLUSIVE DEFINE(THREAD_ATOMCTL8, offsetof (struct thread_info, atomctl8)); #endif + DEFINE(THREAD_CPENABLE, offsetof(struct thread_info, cpenable)); + DEFINE(THREAD_CPU, offsetof(struct thread_info, cpu)); + DEFINE(THREAD_CP_OWNER_CPU, offsetof(struct thread_info, cp_owner_cpu)); #if XTENSA_HAVE_COPROCESSORS DEFINE(THREAD_XTREGS_CP0, offsetof(struct thread_info, xtregs_cp.cp0)); DEFINE(THREAD_XTREGS_CP1, offsetof(struct thread_info, xtregs_cp.cp1)); @@ -137,6 +139,10 @@ int main(void) DEFINE(EXC_TABLE_DOUBLE_SAVE, offsetof(struct exc_table, double_save)); DEFINE(EXC_TABLE_FIXUP, offsetof(struct exc_table, fixup)); DEFINE(EXC_TABLE_PARAM, offsetof(struct exc_table, fixup_param)); +#if XTENSA_HAVE_COPROCESSORS + DEFINE(EXC_TABLE_COPROCESSOR_OWNER, + offsetof(struct exc_table, coprocessor_owner)); +#endif DEFINE(EXC_TABLE_FAST_USER, offsetof(struct exc_table, fast_user_handler)); DEFINE(EXC_TABLE_FAST_KERNEL, |